The immunomodulators (immune system components) that are involved in fighting off infections also affect the brain with regards to sleep and wake. When you have an acute infection of any sort, these immunomodulators actually partially suppress the part of the brain that is responsible for keeping one awake & hence you feel drowsy.

In brief:
Infections and sleep

Yes, an UTI can actually make you drowsy.

The immunomodulators (immune system components) that are involved in fighting off infections also affect the brain with regards to sleep and wake. When you have an acute infection of any sort, these immunomodulators actually partially suppress the part of the brain that is responsible for keeping one awake & hence you feel drowsy.
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